help with text patterns in strings

And is there a way to simultaneously tell R that, for example, ?Friday? is
the same as ?Fri? or ?F?; ?Saturday? is the same as ?Sat? or ?Sa?; etc.?
Look at pmatch (partial match):
  > dayNames <- c("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday")
  > dayNames[pmatch(c("F", "Fr", "Friday", "Tu", "Th", "T", "Lunes"), dayNames, duplicates.ok=TRUE)]
  [1] "Friday"   "Friday"   "Friday"   "Tuesday"  "Thursday" NA         NA
"T" could be either "Tuesday" or "Thursday" so it is mapped to NA, as are entries like "Lunes" that do not match at all.

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf
Of arun
Sent: Monday, June 17, 2013 12:15 PM
To: bcrombie
Cc: R help 
Subject: Re: [R] help with text patterns in strings

Hi,
May be this helps:

dat1<-
data.frame(Ans=c("Friday","Wednesday","Friday,Saturday,Sunday","Saturday","Sat,Sun",
"Th,F,Sa"),stringsAsFactors=FALSE)
?dat1
???????????????????? Ans
1???????????????? Friday
2????????????? Wednesday
3 Friday,Saturday,Sunday
4?????????????? Saturday
5??????????????? Sat,Sun
6??????????????? Th,F,Sa

?vec1<- c("Su","M","Tu","W","Th","F","Sa")
?vec2<-unlist(strsplit(dat1$Ans,","))

vec2

?#[1] "Friday"??? "Wednesday" "Friday"??? "Saturday"? "Sunday"??? "Saturday"
?#[7] "Sat"?????? "Sun"?????? "Th"??????? "F"???????? "Sa"
sapply(vec1,function(x) length(vec2[grep(x,vec2)]) )
#Su? M Tu? W Th? F Sa
# 2? 0? 0? 1? 1? 3? 4

A.K.

----- Original Message -----
From: bcrombie <bcrombie at utk.edu>
To: r-help at r-project.org
Cc:
Sent: Monday, June 17, 2013 1:59 PM
Subject: [R] help with text patterns in strings

Let?s say I have a data set that includes a column of answers to a question
?What days of the week are you most likely to eat steak??.
The answers provided are [1] ?Friday?, [2] ?Wednesday?, [3] ?Friday,
Saturday, Sunday", [4] "Saturday?, [5] ?Sat, Sun?, [6] ?Th, F, Sa?
How can I tell R to count ?Friday, Saturday, Sunday?, ?Sat, Sun?, and ?Th,
F, Sa? as three separate entries for each unique observation?
And is there a way to simultaneously tell R that, for example, ?Friday? is
the same as ?Fri? or ?F?; ?Saturday? is the same as ?Sat? or ?Sa?; etc.?
Thanks for your assistance.

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help with text patterns in strings

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